figured ya'll would be interested...mods feel free to move if warranted
i sliced down the middle of the guides on the center chamber and aliced the end cylinder a little more selectively to check out coolant passage wall thickness. i have yet to drill the many holes for measuring the wall thickness'* in different locations so that i can compare the 2261 casting to the 4781.
2261 being the early 95-97 L36 only heads, and 4781 being the late 98+ L36/67 casting that has the meat for injector boss machining for the L67 in head injectors
i am looking for the casting number (and preferably a junk head) for the 96-97 L67 heads as well as i would like to know the same of the SIII L26/32 castings (and slice one of those up too...)
dont worry i will be using the high res digicam for the good pics after drilling
the valve inserted will be for checking the throat angles to balance mid/high lift flow...i sure hope the L36 4781 has thicker port walls.... (the casting number of our 98 and 99 L67 heads is the same 4781)
next up is one of my 4781 castings (with undrilled inj bosses aka L36 app)
PSYCHOTIC GEARHEADS paying homage to a legend, Hairy Hurst Olds
The first twin V6 94 Oldsmobile 442 462ci-4wd-2 (twin) engines
13.81 @ over 98 MPH! consistent 1.90s 60'! 4330 lbs race weight
something Sinister is coming to Chitown....